Preliminary measurements of indoor radon in Ljubljana, Yugoslavia

In Ljubljana, the capital of Slovenia, one of six Yugoslav republics, 28 houses were selected according to their size, age and construction material, as sampling points to measure indoor air 222Rn concentrations. Air samples were taken very three months and analysed for 222Rn. Radon was isolated from air contained in a 1.2 dm3 sampling glass ampoule, transferred to a scintillation cell and counted. In some homes radon was measured under different microclimatic conditions. In addition, outdoor air was surveyed in winter during a temperature inversion when increased radon concentration is expected in a mass of stagnant polluted air. The results obtained have not been quantitatively elaborated. They merely show a preliminary picture of indoor radon levels in Ljubljana and as such are a good base for a planned nationwide radon monitoring programme. (author)